Forehearth for smelting-furnaces



(No Model.)

2 Sheets-Sheet l. M. W. ILES. POREHEAR'TH FOR SMBLTING'URNAGBS. No. 522,417.

l Patented July 3, 1894.

TN: N ormls PETERS oo.. Prioromma.. wAsmNGTc u. c.

(No Model.) 2 'sheets-sheen 2,

M. W. ILES.

PORBHBARTH FOB SMELTING PURnJmrsf.`

Patented July 3, 1894.

fL- wifnsaw.

j UNITED ,-STATEs' PATENT OEE-ICE.-

i MALvERN w.IL'Es,-oEI DENVER, coLoRADo.

`Fol-EH EARTH FoR .sMELTlNe-FURNACE'S.

SPECIFIGATION forming part of Letters Patent No. 522,417, dated July 3, 1894:.

' 'Application nea my 20,1292. serial no. 440.588. (No man.)

To @ZZ whom it may empeora.-

Beit known that I, MALVERN W. ILES, of

Denver, county of Arapahoe, State of Colo-y the object of my improvement being to provide a fore-hearth in which a very complete separation of the matte from the slag can be made, which can be readily removed and re! placed when necessary,`an d the construction of which is at once simple and well adapted to the purpose to which the fore-hearth is put.

The nature of my inventionwill be best understood as described in connection with the drawings in which lit vis illustrated,` and in, whichj v i l Figure 1 is 'a front elevation of a furnace provided and combined with -my improvements. Fig. 2 is a plan view of the same; Fig. 3 alongitudinal section through the forehearth on the line l-r-2 of Fig. 2; Fig. 4 a cross section through the fore-hearth on the line 3-4 of Fig. 3; Fig. 5 an end view of the fore-hearth, and Fig. 6 a horizontal section through the fore-hearth on the line 5-,6 of Fig. 4.

A indicates the smelting furnace which is provided with a slag tap B, in front of which is secured a slag spout B' through which the slag and matte are conducted from the furnace to the fore-hearth. This slag spout is curved to one side 'as indicated in Figs. 1 andv 2 so that the slag with its contained particles 0f matt-e will be delivered'againstone of the end walls of the fore-hearth.'

C indicatesthefore-hearth which is mounted upon wheels E secured to axles E upon which in turn the fore-hearth rests.

The fore-hearth rests by means of its wheels upon a short -piece of track R extending in front of the furnace and lrunning at rightangles or substantially so to a depressed track S situated at the side of the furnace,- and upon which runs a truck T having secured to its top, rails T T which, when the truck is inv proper condition, register with the rails of the track R so that the forefhearth, when it is desired to replace it or remove it for repairs, is run directly from the track R to track I and then carried away on the truck T, another fore-hearth being rapidly `brought to take its place by the same device. The truck lT or rather a similar truck provided with slag pots asjindicated in dotted lines vatU, Fig. 1, is used to receive the slag which runs from the fore-hearth while in operation and to carryit away. `f indicates stops upon the as to deliver the slag into receptacles such as are indicated at U. At the'bottomof the site to that from'which the slag spout leads, is a matte tap, H', which' I make of a vertically elongated forlnyvas shown, so that `in case the matte or slag chills on the bottom of The combination with the `fore-hearth and the furnace of the curved slag spout B is of importance because it enables 'me to deliver the matte carrying slag issuing from the furnace to the fore-hearth in a direction opposite to that in which the slag is flowing through and from the fore-hearth; and -this contrivance I have found to eect a considerable irnslag; the reason being, because the matte is heavier than the slag and will change its direction of movement more slowly; hence, by introducing the slag from the furnace in the opposite direction to that in which I withdraw the slag from the fore-hearth I give the matte a better opportunity tosettle to the bottom. This mode or method of eecting truck T which hold in place the truck of the` fore-hearth when it is run uponthe track T.

At thetop of the forefhearth a slag spout Q leads from one of the ends in such position used tap hole would be entirely inoperative. Y

fore-heartland preferably yat the end oppoprovement in the separation ofthe matte and i IOO the separation of matte and slag is described and claimed in my pending application filed December 2l, 1891, Serial No. 415,696. l

Referring now to the construction of the fore-hearth itself, D is a cast iron bottom plate to which the axles E are attached, and which on its upper face is formed with a projecting .rim or series of lugs as indicated at d, the lower face of this plate is preferably also provided witha Hangs-like rim as indicated at d.

The sides of the fore-hearth are made up of four iron .plates F F, G G. These plates rest upon the bottom plate inside of the flange (Z as indicated in Figs. 3 and 4:. One pair .of plates asF F are provided with inwardly projecting lugs f situated near their ends and the plates G G rest against these lugs, the whole four plates being secured together by clamping bolts as shown. Bars I I extending along the sides are clamped together by long bolts J, and bars J extending along the ends are clamped together by means of long bolts 1 I', tie rods K K extending downward from the bolts I to the bottom plate or the axles E.

The inside of the fore-hearth is lined with refractory material such as lire-brick indicated at L, and upon the outside of the plates making up the fore-hearth are secured plates of non-conducting material as indicated at M, each plate is provided with its own non-con ducting jacket, and for the purpose of receiving it is formed with outwardly extending flanges as indicated at f g the non-conductingmaterial beinginclosed between these Iianges and held in place by sheet-iron plates as indicated at N.

Preventing the escape of heat through the walls of the fore-hearth as above described I also prevent, as far as possible, radiation from the top of the fore-hearth by providing it with a removable cover O which is made to lit down upon the top of the fore-hearth'and provided with wedge shaped lugs p between which the fire-brick lining is secured and formed with outwardly extending ianges to contain nonconducting material M as in the case of the plates making up the fore-hearth itself. The cover is formed with an opening P at one cor ner to receive the slag, the end of the curved spout B extending into this opening, and another opening or notch P2 is formed in the cover at a point which comes above the slag opening Q, this notch being founddesirable to prevent clogging at that point. "The cover is furnished with eyes as indicated at P3 so that it can be hoisted oit the fore-hearth when it is desired to remove it.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In combination with a furnace a curved slag spout B and a fore-hearth C against one side of which the spout B is adapted to discharge, and having a slag spout at the top of `theside .farthest vfrom the end of spout B and a matte tap at its bottom substantially as and for the purpose specified.

2. A fore-hearth C having an iron bottom and side plates all made separate and clamped together so as to be removable, tire-brick lining on the inside of` the fore-hearth and an outside covering of non-conducting material secured in separate plates to each of the removable pieces.

3. A fore-hearth C having in combination a bottom plate D with upwardly projecting rim cl, sides F with inwardly extending lugs f, sides G adapted to rest against lugs f,.and clamping irons for holding the bottom and sides together substantially as and for the purpose specified.

4. A fore-hearth C having in combination a Y bottom plate D with upwardly projecting rim d, sides F with inwardly extending lugs f at somedistance from their ends,sides G adapted to rest against lugs f, said sides F and G having outwardly extending rilns f' and g', and clamping irons adapted to hold the bottom and side plates together.

5. In combination with a fore-hearth C a cover 0 adapted to cover the fore-hearth and having an opening P' at one corner for the admission of slag and matte and a notch P2 arranged to come immediately above the slag spout leading from the fore-hearth.

6. In combination With a fore-hearth C a cover O adapted to cover the fore-hearth, and having internal ribs 1J to hold a lining and an external rim to hold a non-conducting COVGI'.

MALVERN W. ILES. Witnesses:

JOHN S. WILLIAMs, CLARENCE T. DYE. 

